Toyota Yaris: Power Steering Ecu / Installation

INSTALLATION

CAUTION / NOTICE / HINT

NOTICE:

After performing the update ECU security key procedure, make sure to perform the initialization procedure for when the cable has been disconnected and reconnected to the negative (-) auxiliary battery terminal.

PROCEDURE

1. INSTALL ELECTRIC POWER STEERING MOTOR SHAFT DAMPER

Grease

(a) Apply grease to a new electric power steering motor shaft damper.

NOTICE:

First wipe off the existing grease from the serrated part, and then apply the dedicated grease supplied with a new power steering ECU assembly or electric power steering column sub-assembly.

(b) Install the electric power steering motor shaft damper to the electric power steering column sub-assembly.

2. INSTALL POWER STEERING ECU ASSEMBLY

(a) Temporarily install the power steering ECU assembly to the electric power steering column sub-assembly with the 2 bolts. NOTICE: When temporarily installing the 2 bolts to the power steering ECU assembly, do not tighten them all the way down.

(b) Using a 10 mm hexagon socket wrench, install the steering wheel assembly set bolt to the steering main shaft. NOTICE: Do not apply excessive torque to the steering wheel assembly set bolt by using a tool such as an impact wrench. HINT: The steering wheel assembly set bolt is used for turning the steering main shaft during inspection of the steering main shaft rotating torque. Remove the steering wheel assembly set bolt after performing this inspection.

(c) Secure the steering column assembly in a vise using aluminum plates, cloths and wooden blocks. NOTICE: Do not overtighten the vise, as the steering column assembly may become deformed. Secure the power steering ECU assembly so that it is upright. Support the steering column assembly with wooden blocks or similar items to ensure that it does not fall.

*a Wooden Block *b Cloth

Rotate

(d) Rotate the steering main shaft 180 degrees counterclockwise and then 180 degrees clockwise at a speed of 60 rpm, and repeat 2 to 3 times to center the axis of the power steering ECU assembly. [*1]

(e) Tighten the 2 bolts. [*2]

Torque:

18.5 N·m {189 kgf·cm, 14 ft·lbf}

(f) Using a torque wrench, measure the turning torque of the steering main shaft.

Preload:

1.0 to 2.2 N*m (11 to 22 kgf*cm, 9 to 19 in.*lbf)

NOTICE:

Ensure that there is no abnormal resistance during rotation.

Turn

(g) If the turning torque is not as specified, loosen the 2 bolts and repeat steps [*1] and [*2] to recenter the axis of the power steering ECU assembly.

(h) Remove the steering wheel assembly set bolt.

(i) Connect the connector.

3. INSTALL STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY

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4. ALIGN FRONT WHEELS FACING STRAIGHT AHEAD

5. INSTALL STEERING COLUMN ASSEMBLY

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6. INSTALL NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY

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7. CONNECT NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY

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8. INSTALL COLUMN HOLE COVER SILENCER SHEET

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9. INSTALL NO. 1 AIR DUCT

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10. INSTALL STOP LIGHT SWITCH ASSEMBLY

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11. INSTALL LOWER INSTRUMENT PANEL FINISH PANEL ASSEMBLY

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12. CONNECT HOOD LOCK CONTROL LEVER SUB-ASSEMBLY

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13. INSTALL NO. 1 INSTRUMENT SIDE PANEL

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14. INSTALL FRONT DOOR OPENING TRIM WEATHERSTRIP LH

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15. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

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16. INSTALL COWL SIDE TRIM BOARD LH

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17. INSTALL FRONT DOOR SCUFF PLATE LH

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18. INSTALL CONSOLE BOX ASSEMBLY

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19. INSTALL TURN SIGNAL SWITCH ASSEMBLY WITH SPIRAL CABLE SUB-ASSEMBLY

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20. INSTALL UPPER STEERING COLUMN COVER

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21. INSTALL LOWER STEERING COLUMN COVER

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22. ALIGN FRONT WHEELS FACING STRAIGHT AHEAD

23. ADJUST SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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24. INSTALL STEERING WHEEL ASSEMBLY

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25. INSTALL HORN BUTTON ASSEMBLY

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26. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL

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27. UPDATE ECU SECURITY KEY

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28. PERFORM POWER STEERING ECU INITIAL SETTING

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29. INSPECT HORN BUTTON ASSEMBLY

(a) Make sure that the horn sounds.

If the horn does not sound, inspect the horn system.

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30. PERFORM CODE REGISTRATION

HINT:

When replacing the steering lock actuator or upper bracket assembly, perform code registration.

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31. CHECK STEERING WHEEL CENTER POINT

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32. PERFORM DIAGNOSTIC SYSTEM CHECK

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33. INSPECT SRS WARNING LIGHT

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34. INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here